Struct ToolStat 

pub struct ToolStat {
    pub name: String,
    pub calls: u64,
    pub errors: u64,
    pub result_bytes: u64,
}

One tool’s tally: how many times it was called, how many of those calls did not succeed, and how many bytes its results fed the context.

errors counts every ToolResult { is_error: true } paired to this tool’s ToolCall — INCLUDING the loop’s synthesized aborts for blocked/unexecuted calls (loop_.rs:650 output: "aborted before execution", fn synthesize_unexecuted at loop_.rs:798). So “error” here means the call did not succeed, not the tool is buggy; v1 does not separate “blocked by a hook” from “failed” (that would need a new transcript flag).

result_bytes = Σ ToolResult.output.len() — the honest stand-in for a per-tool token count, which nothing records: ToolOutput has no token field (tool.rs:23 pub struct ToolOutput { … fields end at tool.rs:35 pub path: Option<String>,) and usage is per TURN, provider-billed (message.rs:21). It answers “which tool is eating my window?” without inventing a number.

Fields

name: String

calls: u64

errors: u64

result_bytes: u64

Trait Implementations

impl Clone for ToolStat

fn clone(&self) -> Self

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for ToolStat

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for ToolStat

fn default() -> Self

Returns the “default value” for a type.

impl<'de> Deserialize<'de> for ToolStat

fn deserialize<__D>(__deserializer: __D) -> Result<Self, __D::Error>

where __D: Deserializer<'de>,

Deserialize this value from the given Serde deserializer.

impl Eq for ToolStat

impl PartialEq for ToolStat

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl Serialize for ToolStat

fn serialize<__S>(&self, __serializer: __S) -> Result<__S::Ok, __S::Error>

where __S: Serializer,

Serialize this value into the given Serde serializer.

impl StructuralPartialEq for ToolStat